https://davidshimjs.github.io/qrcodejs/

QRCode.js
QRCode.js is javascript library for making QRCode. QRCode.js supports Cross-browser with HTML5 Canvas and table tag in DOM. QRCode.js has no dependencies.

Basic Usages
<div id="qrcode"></div>
<script type="text/javascript">
new QRCode(document.getElementById("qrcode"), "http://jindo.dev.naver.com/collie");
</script>
or with some options

var qrcode = new QRCode("test", {

text: "http://jindo.dev.naver.com/collie",
width: 128,
height: 128,
colorDark : "#000000",
colorLight : "#ffffff",
correctLevel : QRCode.CorrectLevel.H

});
and you can use some methods

qrcode.clear(); // clear the code.
qrcode.makeCode("http://naver.com"); // make another code.

var qrcode = new QRCode("myQrcode");
qrcode.makeCode("${codeUrl}");

js代码，jquery代码，找加速网站：https://www.bootcdn.cn/